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21 And say unto them, Thus saith the Lord GOD; Behold, I will take the children of Israel from among the heathen, whither they be gone, and will gather them on every side, and bring them into their own land:
27 And I will put my spirit within you, and cause you to walk in my statutes, and ye shall keep my judgments, and do them.
'To observe' stands for all aspects of the Word in general.
(Odkazy: Arcana Coelestia 3382)